Physics in Your World

In introductory physics you learn how the forces of gravity and friction can change the motion of, for example, a falling rock. But suppose instead of a rock, think about the grains of sand on a beach. The combination of the small mass of each grain and the constant rubbing from the other grains around it make for some interesting physics. To find out more, visit the Physics Central page Granular Materials. Also, check out the surprising images there.

Physics at Home

Try this Oregon Museum of science and industry simulation, mixing primary colors, to see what happens when you mix red, blue, and green light (and you can change the brightness) or red, blue, and green paint.